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    【记录】尝试给Docbook添加MathML的支持

    Docbook crifan 2801浏览 0评论

    【背景】

    收到别人一个邮件，说是在使用Docbook转PDF时，

    对于：

    <inlineequation>
    <m:math display="inline">
      <m:mrow>
        <m:mrow>
          <m:mi>x</m:mi>
          <m:mo>+</m:mo>
          <m:mi>y</m:mi>
        </m:mrow>
        <m:mo>=</m:mo>
        <m:mn>2</m:mn>
      </m:mrow>
    </m:math>
</inlineequation>

    的Math的公示，Docbook不支持，出现下面的错误：

    警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}math" encountered (a child of fo:instream-foreign-object}. (No context info available)

    七月 04, 2014 10:03:11 上午 org.apache.fop.events.LoggingEventListener processEvent

    警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mrow" encountered (a child of math}. (No context info available)

    七月 04, 2014 10:03:11 上午 org.apache.fop.events.LoggingEventListener processEvent

    警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mtext" encountered (a child of mrow}. (No context info available)

    七月 04, 2014 10:03:11 上午 org.apache.fop.events.LoggingEventListener processEvent

    警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mspace" encountered (a child of mrow}. (No context info available)

    七月 04, 2014 10:03:11 上午 org.apache.fop.events.LoggingEventListener processEvent

    然后其另外也去试了试：

    “在转之前用jeuclid先处理xml文件，把公式转成图片，然后再把公式这段代码直接给替换成图片，然后在转成PDF”

     

    【折腾过程】

    1.然后去搜了很多相关的资料：

    Docbook, MathML and PDF

    MathML

    The DocBook MathML Document Type

    http://docbook.org/xml/mathml/1.0/dbmathml.dtd

    mml:*

     

    DocBook Specifications

    -》

    DocBook MathML Module

     

    W3C MathML implementations page

    W3C MathML implementations page

    lf201, Applications: 编辑DocBook XML文档

    -》》》》

    发现：

    http://www.w3.org/1998/Math/MathML/

    是可以打开的->有效的namespace

    而

    http://www.sagehill.net/docbookxsl/MathML.html

    ->

    http://www.w3.org/Math/DTD/mathml2

    是打不开的

    ->无效的namespace？

     

    但是：

    是

    http://www.w3.org/Math/DTD/

    是可以打开的。

     

    对应的有：

    http://www.w3.org/Math/DTD/mathml3/mathml3.dtd

    和：

    http://www.w3.org/Math/DTD/mathml2/mathml2.dtd

     

    2.此处再去对于上述用到的namespace：

    http://www.w3.org/1998/Math/MathML/

    确认是可以打开的：

    mathml url can open MathML Namespace

    3.去搜了搜：

    jeuclid

    找到：

    JEuclid – 其它开源项目 – Java开源大全

    发现是：

    一个工具，可以讲mathml转换为图片的。

    4.所以，此刻就是去自己试试，自己此处是否可以正常工作：

    不过现在搜索：

    Unknown formatting object   MathML math encountered a child of

    找到：

    Re: [docbook] Need help using MathML ("Unknown formatting object "{http:

    其主要建议是：use namespace-aware stylesheets.

    那待会自己去试的时候，也可以注意这点了。

    5.写测试代码期间才发现，我之前自己的Docbook的源码中，就包含了MathML了：

    <preface xml:id="preface"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:ns5="http://www.w3.org/1998/Math/MathML"
    xmlns:ns4="http://www.w3.org/1999/xhtml"
    xmlns:ns3="http://www.w3.org/2000/svg"
    xmlns:ns="http://docbook.org/ns/docbook">
<title>前言</title>

    只是之前没用过罢了。

    6.测试代码：

    <?xml version='1.0' encoding="utf-8"?>

<!DOCTYPE book
[

<!ENTITY cur_book_name      "test_mathml" >
<!ENTITY publish_date       "2014-07-05" >
<!ENTITY release_version    "0.1" >

<!ENTITY copyrith_year "2014" >
]>

<book version="5.0"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    
    xml:lang="zh_CN">
<info>
    <title>测试Mathml</title>
    <subtitle></subtitle>
    <keywordset>
        <keyword>测试</keyword>
        <keyword>MathML</keyword>
    </keywordset>

    <abstract>
        <para>测试MathML是否能正常在转换后的pdf和html中显示</para>
    </abstract>

    <revhistory>
        <revision>
            <revnumber>&release_version;</revnumber>
            <date>&publish_date;</date>
            <revremark>
                <orderedlist>
                    <listitem>第一版</listitem>
                </orderedlist>
            </revremark>
            <authorinitials>crl</authorinitials>
        </revision>
    </revhistory>

</info>

<chapter xml:id="ch01_demo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demo MathML</title>

    <para>
        <inlineequation>
            <mml:math display="inline">
              <mml:mrow>
                <mml:mrow>
                  <mml:mi>x</mml:mi>
                  <mml:mo>+</mml:mo>
                  <mml:mi>y</mml:mi>
                </mml:mrow>
                <mml:mo>=</mml:mo>
                <mml:mn>2</mml:mn>
              </mml:mrow>
            </mml:math>
        </inlineequation> 
    </para>
</chapter>

</book>

    结果编译出错：

    =============================== generating test_mathml pdf ==============================
fop --execdebug -c E:/dev_root/docbook/dev/config/fop/conf/fop.xconf ../output/fo/test_mathml.fo -pdf ../output/pdf/test_mathml.pdf
exec "/cygdrive/c/Program Files/Java/jdk1.7.0_45/bin/java" -classpath "E:/dev_root/docbook/tools/fop-1.0/lib/xmlgraphics-commons-1.4.jar;E:/dev_root/docbook/tools/fop-1.0/lib/xml-apis-ext-1.3.04.jar;E:/dev_root/docbook/tools/fop-1.0/lib/xml-apis-1.3.04.jar;E:/dev_root/docbook/tools/fop-1.0/lib/xercesImpl-2.7.1.jar;E:/dev_root/docbook/tools/fop-1.0/lib/xalan-2.7.0.jar;E:/dev_root/docbook/tools/fop-1.0/lib/serializer-2.7.0.jar;E:/dev_root/docbook/tools/fop-1.0/lib/fop-hyph.jar;E:/dev_root/docbook/tools/fop-1.0/lib/commons-logging-1.0.4.jar;E:/dev_root/docbook/tools/fop-1.0/lib/commons-io-1.3.1.jar;E:/dev_root/docbook/tools/fop-1.0/lib/batik-all-1.7.jar;E:/dev_root/docbook/tools/fop-1.0/lib/avalon-framework-4.2.0.jar;E:/dev_root/docbook/tools/fop-1.0/build/fop.jar;E:/dev_root/docbook/tools/fop-1.0/build/fop-sandbox.jar;E:/dev_root/docbook/tools/fop-1.0/build/fop-hyph.jar" org.apache.fop.cli.Main "-c" "E:/dev_root/docbook/dev/config/fop/conf/fop.xconf" "../output/fo/test_mathml.fo" "-pdf" "../output/pdf/test_mathml.pdf"
七月 05, 2014 3:37:30 下午 org.apache.fop.apps.FopFactoryConfigurator configure
信息: Default page-height set to: 11in
七月 05, 2014 3:37:30 下午 org.apache.fop.apps.FopFactoryConfigurator configure
信息: Default page-width set to: 8.26in
七月 05, 2014 3:37:33 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Font "Cambria Math,normal,700" not found. Substituting with "Cambria Math,normal,400".
七月 05, 2014 3:37:33 下午 org.apache.fop.hyphenation.Hyphenator getHyphenationTree
严重: Couldn't find hyphenation pattern zh_cn
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}math" encountered (a child of fo:instream-foreign-object}. (See position 1027:111)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mrow" encountered (a child of math}. (See position 1028:25)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mrow" encountered (a child of mrow}. (See position 1029:27)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mi" encountered (a child of mrow}. (See position 1030:27)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mo" encountered (a child of mrow}. (See position 1031:27)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mi" encountered (a child of mrow}. (See position 1032:27)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mo" encountered (a child of mrow}. (See position 1034:25)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
警告: Unknown formatting object "{http://www.w3.org/1998/Math/MathML}mn" encountered (a child of mrow}. (See position 1035:25)
七月 05, 2014 3:37:34 下午 org.apache.fop.events.LoggingEventListener processEvent
严重: The intrinsic dimensions of an instream-foreign-object could not be determined. (See position 1027:37)

    看起来，此处的fop中，暂时不支持MathML。

    估计需要加入对应的库才可以？

    7.把测试代码换成：

    MathML

    中的：

    <equation>
<title>My MathML example</title>
<mml:math>
  <mml:mrow>
    <mml:mn>4</mml:mn>
    <mml:mo>+</mml:mo>
    <mml:mi>x</mml:mi>
  </mml:mrow>
</mml:math>
</equation>

    即：

    <chapter xml:id="ch01_demo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demo MathML</title>

    <equation>
    <title>My MathML example</title>
    <mml:math>
      <mml:mrow>
        <mml:mn>4</mml:mn>
        <mml:mo>+</mml:mo>
        <mml:mi>x</mml:mi>
      </mml:mrow>
    </mml:math>
    </equation>

</chapter>

    然后结果是：

    还是同样错误。

    8.google搜：

    Unknown formatting object "{http://www.w3.org/1998/Math/MathML}math" encountered (a child of fo:instream-foreign-object}

    找到：

    docbook General – Need help using MathML ("Unknown formatting object "{http://www.w3.org/1998/Math/MathML}math" encountered")

    然后去看看：

    http://jeuclid.sourceforge.net/trunk/jeuclid-fop/

    然后找到对应的下载的地方：

    http://jeuclid.sourceforge.net/trunk/index.html

    ->

    http://sourceforge.net/projects/jeuclid/files/3.1.x/

    ->

    http://sourceforge.net/projects/jeuclid/files/3.1.x/3.1.9/

    ->

    找了下fop的jar库：

    jeuclid-fop-3.1.9-distribution.zip

    然后解压拷贝对应的：

    copy jeuclid-core-3.1.9 and jeuclid-fop-3.1.9.jar to lib

    • jeuclid-core-3.1.9.jar
    • jeuclid-fop-3.1.9.jar

     

    到fop的lib中：

    copy two jeuclid lib to fop lib folder

    然后再去编译看看。

    然后就真的没有错误了。

    生成的pdf效果是：

    jeuclid fop lib generate pdf effect

    很明显，没有看到我们想要的复杂的效果。

    所以再去试试别的MathML的例子。

    9.去把jeuclid中的example：

    E:\dev_root\docbook\tools\MathML\jeuclid-fop-3.1.9-distribution\jeuclid-fop-3.1.9\example\example.mml

    中的内容整合过来试试：

    <chapter xml:id="ch01_demo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demo MathML</title>

    <equation>
    <title>My MathML example</title>
    <mml:math>
      <mml:mrow>
        <mml:mn>4</mml:mn>
        <mml:mo>+</mml:mo>
        <mml:mi>x</mml:mi>
      </mml:mrow>
    </mml:math>
    </equation>

    <math xmlns="http://www.w3.org/1998/Math/MathML" mode="display">
      <mrow>
        <mo stretchy="false">{</mo>
        <munder>
          <mrow>
            <mover>
              <mrow>
                <mpadded width="0"/>
                <!--mpadded width="0">(</mpadded-->
                <!-- \mathstrut -ugly hack a la TeX -->
                <mi>a</mi>
                <mo>,</mo>
                <mo>...</mo>
                <mo>,</mo>
                <mi>a</mi>
              </mrow>
              <mover>
                <mo>︷</mo>
                <mrow>
                  <mi>k</mi>
                  <mtext> </mtext>
                  <mi>a</mi>
                  <mtext>'s</mtext>
                </mrow>
              </mover>
            </mover>
            <mo>,</mo>
            <mover>
              <mrow>
                <mpadded/>
                <!--mpadded width="0">(</mpadded-->
                <!-- \mathstrut -ugly hack a la TeX -->
                <mi>b</mi>
                <mo>,</mo>
                <mo>...</mo>
                <mo>,</mo>
                <mi>b</mi>
              </mrow>
              <mover>
                <mo>︷</mo>
                <mrow>
                  <mi>ℓ</mi>
                  <mtext> </mtext>
                  <mi>b</mi>
                  <mtext>'s</mtext>
                </mrow>
              </mover>
            </mover>
          </mrow>
          <munder>
            <mo>︸</mo>
            <mrow>
              <mi>k</mi>
              <mo>+</mo>
              <mi>ℓ</mi>
              <mtext> elements</mtext>
            </mrow>
          </munder>
        </munder>
        <mo stretchy="false">}</mo>
      </mrow>
    </math>
    
</chapter>

    编译结果是出错：

    org.apache.fop.apps.FOPException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:302)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)
Caused by: javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:501)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        ... 3 more
Caused by: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        ... 4 more

---------

javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:501)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)
Caused by: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        ... 4 more
---------
org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1316:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)

../../../../config/docbook.mk:560: recipe for target `../output/pdf/test_mathml.pdf' failed
make: *** [../output/pdf/test_mathml.pdf] Error 1

    10.算了，换成带namespace的：

    <chapter xml:id="ch01_demml:mo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demml:mo MathML</title>

      <mml:mrow>
        <mml:mo stretchy="false">{</mml:mo>
        <mml:munder>
          <mml:mrow>
            <mml:mover>
              <mml:mrow>
                <mml:mpadded width="0"/>
                <!--mml:mpadded width="0">(</mml:mpadded-->
                <!-- \mathstrut -ugly hack a la TeX -->
                <mml:mi>a</mml:mi>
                <mml:mo>,</mml:mo>
                <mml:mo>...</mml:mo>
                <mml:mo>,</mml:mo>
                <mml:mi>a</mml:mi>
              </mml:mrow>
              <mml:mover>
                <mml:mo>︷</mml:mo>
                <mml:mrow>
                  <mml:mi>k</mml:mi>
                  <mtext> </mtext>
                  <mml:mi>a</mml:mi>
                  <mtext>'s</mtext>
                </mml:mrow>
              </mml:mover>
            </mml:mover>
            <mml:mo>,</mml:mo>
            <mml:mover>
              <mml:mrow>
                <mml:mpadded/>
                <!--mml:mpadded width="0">(</mml:mpadded-->
                <!-- \mathstrut -ugly hack a la TeX -->
                <mml:mi>b</mml:mi>
                <mml:mo>,</mml:mo>
                <mml:mo>...</mml:mo>
                <mml:mo>,</mml:mo>
                <mml:mi>b</mml:mi>
              </mml:mrow>
              <mml:mover>
                <mml:mo>︷</mml:mo>
                <mml:mrow>
                  <mml:mi>ℓ</mml:mi>
                  <mtext> </mtext>
                  <mml:mi>b</mml:mi>
                  <mtext>'s</mtext>
                </mml:mrow>
              </mml:mover>
            </mml:mover>
          </mml:mrow>
          <mml:munder>
            <mml:mo>︸</mml:mo>
            <mml:mrow>
              <mml:mi>k</mml:mi>
              <mml:mo>+</mml:mo>
              <mml:mi>ℓ</mml:mi>
              <mtext> elements</mtext>
            </mml:mrow>
          </mml:munder>
        </mml:munder>
        <mml:mo stretchy="false">}</mml:mo>
      </mml:mrow>

</chapter>

    编译结果是：

    还是出错。

    11.算了，去找个简单的MathML的例子吧。。

    docbook General – Need help using MathML ("Unknown formatting object "{http://www.w3.org/1998/Math/MathML}math" encountered")

        <informalequation>
    <mml:math>
      <mml:msup>
        <mml:mi>x</mml:mi>
        <mml:mn>3</mml:mn>
      </mml:msup>
    </mml:math>
    </informalequation>

    结果是：

    可以正常生产pdf：

    another example can generate mathml ok

    12.再去试试：

        <inlineequation>
        <mml:math display="inline">
          <mml:mrow>
            <mml:mrow>
              <mml:mi>x</mml:mi>
              <mml:mo>+</mml:mo>
              <mml:mi>y</mml:mi>
            </mml:mrow>
            <mml:mo>=</mml:mo>
            <mml:mn>2</mml:mn>
          </mml:mrow>
        </mml:math>
    </inlineequation>

    结果是：

    出错了：

    org.apache.fop.apps.FOPException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:302)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)
Caused by: javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:501)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        ... 3 more
Caused by: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        ... 4 more

---------

javax.xml.transform.TransformerException: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:501)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)
Caused by: org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        ... 4 more
---------
org.apache.fop.fo.ValidationException: "{http://www.w3.org/1999/XSL/Format}instream-foreign-object" is not a valid child of "fo:flow"! (See position 1026:35)
        at org.apache.fop.events.ValidationExceptionFactory.createException(ValidationExceptionFactory.java:38)
        at org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:54)
        at org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:175)
        at com.sun.proxy.$Proxy1.invalidChild(Unknown Source)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:534)
        at org.apache.fop.fo.FONode.invalidChildError(FONode.java:517)
        at org.apache.fop.fo.pagination.Flow.validateChildNode(Flow.java:103)
        at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.startElement(FOTreeBuilder.java:267)
        at org.apache.fop.fo.FOTreeBuilder.startElement(FOTreeBuilder.java:171)
        at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1072)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.xinclude.XIncludeHandler.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:299)
        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
        at org.apache.fop.cli.Main.startFOP(Main.java:174)
        at org.apache.fop.cli.Main.main(Main.java:205)

    所以去尝试解决此MathML的语言错误。

    13.去查查MathML的语法。

    找到了官网：

    MathML Namespace

    ->

    Mathematical Markup Language (MathML) Version 3.0

    ->

    Presentation Markup

    里面有N多例子和详细语法的解释。

    14.最后，终于搞清楚上述的错误原因了：

    误把informalequation弄成了inlineequation

    ->是的编译时出错，说是，对于（inlineequation的）instream-foreign-object其下不支持fo:flow

    ->而对于本身informalequation，是正常支持的

    最后，用：

    <chapter xml:id="ch01_demml:mo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demo MathML</title>

    <informalequation>
        <mml:math display="inline">
          <mml:mrow>
            <mml:mrow>
              <mml:mi>x</mml:mi>
              <mml:mo>+</mml:mo>
              <mml:mi>y</mml:mi>
            </mml:mrow>
            <mml:mo>=</mml:mo>
            <mml:mn>2</mml:mn>
          </mml:mrow>
        </mml:math>
    </informalequation>

</chapter>

    就可以正常的生成pdf了：

    finnally use informalequation instead of inlineequation to docbook to pdf ok

    15.另外，再去参考官网的很多例子：

    去试试各种效果：

    （1）代码：

    <informalequation>
    <mml:math>
        <mml:mrow>
           <mml:mo> ( </mml:mo>
           <mml:mfrac linethickness="0">
              <mml:mi> a </mml:mi>
              <mml:mi> b </mml:mi>
           </mml:mfrac>
           <mml:mo> ) </mml:mo>
        </mml:mrow>
        <mml:mfrac linethickness="2">
           <mml:mfrac>
              <mml:mi> a </mml:mi>
              <mml:mi> b </mml:mi>
           </mml:mfrac>
           <mml:mfrac>
              <mml:mi> c </mml:mi>
              <mml:mi> d </mml:mi>
           </mml:mfrac>
        </mml:mfrac>
    </mml:math>
</informalequation>

    效果：

    mfrac effect of mathml not good

    评价：不太好，和原先官网的效果有很大差距。。。

    （2）代码：

    <informalequation>
    <mml:math>
        <mml:mfrac>
           <mml:mn> 1 </mml:mn>
           <mml:mrow>
              <mml:msup>
                 <mml:mi> x </mml:mi>
                 <mml:mn> 3 </mml:mn>
               </mml:msup>
               <mml:mo> + </mml:mo>
               <mml:mfrac>
                 <mml:mi> x </mml:mi>
                 <mml:mn> 3 </mml:mn>
               </mml:mfrac>
           </mml:mrow>
        </mml:mfrac>
        <mml:mo> = </mml:mo>
        <mml:mfrac bevelled="true">
           <mml:mn> 1 </mml:mn>
           <mml:mrow>
              <mml:msup>
                 <mml:mi> x </mml:mi>
                 <mml:mn> 3 </mml:mn>
               </mml:msup>
               <mml:mo> + </mml:mo>
               <mml:mfrac>
                 <mml:mi> x </mml:mi>
                 <mml:mn> 3 </mml:mn>
               </mml:mfrac>
           </mml:mrow>
        </mml:mfrac>
    </mml:math>
</informalequation>

    效果：

    another mfrac and mn mrow mi mo good effect

    评价：效果真心不错。

    16.另外再参考：

    Presentation Examples

    最后来个大集合：

    <?xml version='1.0' encoding="utf-8"?>

<!DOCTYPE book
[

<!ENTITY cur_book_name      "test_mathml" >
<!ENTITY publish_date       "2014-07-05" >
<!ENTITY release_version    "0.1" >

<!ENTITY copyrith_year "2014" >
]>

<book version="5.0"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    
    xml:lang="zh_CN">
<info>
    <title>测试Mathml</title>
    <subtitle></subtitle>
    <keywordset>
        <keyword>测试</keyword>
        <keyword>MathML</keyword>
    </keywordset>

    <abstract>
        <para>测试MathML是否能正常在转换后的pdf和html中显示</para>
    </abstract>

    <revhistory>
        <revision>
            <revnumber>&release_version;</revnumber>
            <date>&publish_date;</date>
            <revremark>
                <orderedlist>
                    <listitem>第一版</listitem>
                </orderedlist>
            </revremark>
            <authorinitials>crl</authorinitials>
        </revision>
    </revhistory>

</info>

<chapter xml:id="ch01_demml:mo_mathml"
    xmlns="http://docbook.org/ns/docbook"
    xmlns:xl="http://www.w3.org/1999/xlink"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:mml="http://www.w3.org/1998/Math/MathML"
    xmlns:ns="http://docbook.org/ns/docbook">
    <title>demo MathML</title>

    <sect1 xml:id="mathml_demo_mrow"><title>MathML演示：mrow的效果</title>
        <para>代码：</para>
        <programlisting language="xml">
<![CDATA[
    <informalequation>
        <mml:math display="inline">
          <mml:mrow>
            <mml:mrow>
              <mml:mi>x</mml:mi>
              <mml:mo>+</mml:mo>
              <mml:mi>y</mml:mi>
            </mml:mrow>
            <mml:mo>=</mml:mo>
            <mml:mn>2</mml:mn>
          </mml:mrow>
        </mml:math>
    </informalequation>
]]>
        </programlisting>
        <para>效果：</para>
        <informalequation>
            <mml:math display="inline">
              <mml:mrow>
                <mml:mrow>
                  <mml:mi>x</mml:mi>
                  <mml:mo>+</mml:mo>
                  <mml:mi>y</mml:mi>
                </mml:mrow>
                <mml:mo>=</mml:mo>
                <mml:mn>2</mml:mn>
              </mml:mrow>
            </mml:math>
        </informalequation>
    </sect1>

    <sect1 xml:id="mathml_demo_msup"><title>MathML演示：msup的效果</title>
        <para>代码：</para>
        <programlisting language="xml">
<![CDATA[
    <informalequation>
        <mml:math>
          <mml:msup>
            <mml:mi>x</mml:mi>
            <mml:mn>3</mml:mn>
          </mml:msup>
        </mml:math>
    </informalequation>
    
    <informalequation>
        <mml:math>
          <mml:msup>
            <mml:msqrt>
              <mml:mrow>
                <mml:mi>a</mml:mi>
                <mml:mo>+</mml:mo>
                <mml:mi>b</mml:mi>
              </mml:mrow>
            </mml:msqrt>
            <mn>27</mn>
          </mml:msup>
        </mml:math>
    </informalequation>
]]>
        </programlisting>
        <para>效果：</para>
        <informalequation>
            <mml:math>
              <mml:msup>
                <mml:mi>x</mml:mi>
                <mml:mn>3</mml:mn>
              </mml:msup>
            </mml:math>
        </informalequation>
        
        <informalequation>
            <mml:math>
              <mml:msup>
                <mml:msqrt>
                  <mml:mrow>
                    <mml:mi>a</mml:mi>
                    <mml:mo>+</mml:mo>
                    <mml:mi>b</mml:mi>
                  </mml:mrow>
                </mml:msqrt>
                <mn>27</mn>
              </mml:msup>
            </mml:math>
        </informalequation>
    </sect1>

    <sect1 xml:id="mathml_demo_mfrac_1"><title>MathML演示：mfrac的效果1</title>
        <para>代码：</para>
        <programlisting language="xml">
<![CDATA[
    <informalequation>
        <mml:math>
            <mml:mrow>
               <mml:mo> ( </mml:mo>
               <mml:mfrac linethickness="0">
                  <mml:mi> a </mml:mi>
                  <mml:mi> b </mml:mi>
               </mml:mfrac>
               <mml:mo> ) </mml:mo>
            </mml:mrow>
            <mml:mfrac linethickness="2">
               <mml:mfrac>
                  <mml:mi> a </mml:mi>
                  <mml:mi> b </mml:mi>
               </mml:mfrac>
               <mml:mfrac>
                  <mml:mi> c </mml:mi>
                  <mml:mi> d </mml:mi>
               </mml:mfrac>
            </mml:mfrac>
        </mml:math>
    </informalequation>
]]>
        </programlisting>
        <para>效果：</para>
        <informalequation>
            <mml:math>
                <mml:mrow>
                   <mml:mo> ( </mml:mo>
                   <mml:mfrac linethickness="0">
                      <mml:mi> a </mml:mi>
                      <mml:mi> b </mml:mi>
                   </mml:mfrac>
                   <mml:mo> ) </mml:mo>
                </mml:mrow>
                <mml:mfrac linethickness="2">
                   <mml:mfrac>
                      <mml:mi> a </mml:mi>
                      <mml:mi> b </mml:mi>
                   </mml:mfrac>
                   <mml:mfrac>
                      <mml:mi> c </mml:mi>
                      <mml:mi> d </mml:mi>
                   </mml:mfrac>
                </mml:mfrac>
            </mml:math>
        </informalequation>
    </sect1>

    <sect1 xml:id="mathml_demo_mfrac_2"><title>MathML演示：mfrac的效果2</title>
        <para>代码：</para>
        <programlisting language="xml">
<![CDATA[
    <informalequation>
        <mml:math>
            <mml:mfrac>
               <mml:mn> 1 </mml:mn>
               <mml:mrow>
                  <mml:msup>
                     <mml:mi> x </mml:mi>
                     <mml:mn> 3 </mml:mn>
                   </mml:msup>
                   <mml:mo> + </mml:mo>
                   <mml:mfrac>
                     <mml:mi> x </mml:mi>
                     <mml:mn> 3 </mml:mn>
                   </mml:mfrac>
               </mml:mrow>
            </mml:mfrac>
            <mml:mo> = </mml:mo>
            <mml:mfrac bevelled="true">
               <mml:mn> 1 </mml:mn>
               <mml:mrow>
                  <mml:msup>
                     <mml:mi> x </mml:mi>
                     <mml:mn> 3 </mml:mn>
                   </mml:msup>
                   <mml:mo> + </mml:mo>
                   <mml:mfrac>
                     <mml:mi> x </mml:mi>
                     <mml:mn> 3 </mml:mn>
                   </mml:mfrac>
               </mml:mrow>
            </mml:mfrac>
        </mml:math>
    </informalequation>
]]>
        </programlisting>
        <para>效果：</para>
        <informalequation>
            <mml:math>
                <mml:mfrac>
                   <mml:mn> 1 </mml:mn>
                   <mml:mrow>
                      <mml:msup>
                         <mml:mi> x </mml:mi>
                         <mml:mn> 3 </mml:mn>
                       </mml:msup>
                       <mml:mo> + </mml:mo>
                       <mml:mfrac>
                         <mml:mi> x </mml:mi>
                         <mml:mn> 3 </mml:mn>
                       </mml:mfrac>
                   </mml:mrow>
                </mml:mfrac>
                <mml:mo> = </mml:mo>
                <mml:mfrac bevelled="true">
                   <mml:mn> 1 </mml:mn>
                   <mml:mrow>
                      <mml:msup>
                         <mml:mi> x </mml:mi>
                         <mml:mn> 3 </mml:mn>
                       </mml:msup>
                       <mml:mo> + </mml:mo>
                       <mml:mfrac>
                         <mml:mi> x </mml:mi>
                         <mml:mn> 3 </mml:mn>
                       </mml:mfrac>
                   </mml:mrow>
                </mml:mfrac>
            </mml:math>
        </informalequation>
    </sect1>


    <sect1 xml:id="mathml_demo_mfenced"><title>MathML演示：mfenced的效果</title>
        <para>代码：</para>
        <programlisting language="xml">
<![CDATA[
    <informalequation>
        <mml:math>
          <mml:mrow>
            <mml:msup>
              <mml:mfenced open="[" close="]">
                <mml:mrow>
                  <mml:mi>a</mml:mi>
                  <mml:mo>+</mml:mo>
                  <mml:mi>b</mml:mi>
                </mml:mrow>
              </mml:mfenced>
              <mn>260</mn>
            </mml:msup>
            <mml:mo>+</mml:mo>
            <mml:msub>
              <mml:mfenced open="{" close="}">
                <mml:mrow>
                  <mml:mi>a</mml:mi>
                  <mml:mo>+</mml:mo>
                  <mml:mi>b</mml:mi>
                </mml:mrow>
              </mml:mfenced>
              <mml:mi>i</mml:mi>
            </mml:msub>
          </mml:mrow>
        </mml:math>
    </informalequation>
]]>
        </programlisting>
        <para>效果：</para>
        <informalequation>
            <mml:math>
              <mml:mrow>
                <mml:msup>
                  <mml:mfenced open="[" close="]">
                    <mml:mrow>
                      <mml:mi>a</mml:mi>
                      <mml:mo>+</mml:mo>
                      <mml:mi>b</mml:mi>
                    </mml:mrow>
                  </mml:mfenced>
                  <mn>260</mn>
                </mml:msup>
                <mml:mo>+</mml:mo>
                <mml:msub>
                  <mml:mfenced open="{" close="}">
                    <mml:mrow>
                      <mml:mi>a</mml:mi>
                      <mml:mo>+</mml:mo>
                      <mml:mi>b</mml:mi>
                    </mml:mrow>
                  </mml:mfenced>
                  <mml:mi>i</mml:mi>
                </mml:msub>
              </mml:mrow>
            </mml:math>
        </informalequation>
    </sect1>

</chapter>

</book>

    效果：

    collect many mathml code and example 1

    collect many mathml code and example 2

    collect many mathml code and example 3

    collect many mathml code and example 4

    collect many mathml code and example 5

    collect many mathml code and example 6

    collect many mathml code and example 7

    评价：

    其中部分的内容，显示异常，比如开根号之后的27次方等内容。

     

    【总结】

    此处在fop中用jeuclid去支持MathML的效果是：

    1.一般的内容，都是可以正常输出pdf效果的。

    2.有些复杂的，输出效果，要么是格式不对，要么是缺少内容。

    总体评价：凑合用吧。

    转载请注明：在路上 » 【记录】尝试给Docbook添加MathML的支持

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